Microstructure of Movement During a Tapping Task: Case Findings Using Motion Analysis Videography

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The purposes of this paper are twofold: 1) to familiarize clinicians with kinematic terminology, and 2) to illustrate the use of computerized motion analysis videography to examine the microstructure of movement. Three subject videotapes were chosen based on performance data from a previous study: Subject 1, accurate and slow; Subject 2, inaccurate and fast; and Subject 3, accurate and fast. The task required the child to tap reciprocally between two targets. Kinematic comparisons among the three subjects revealed differences in how the children approached the task and how they monitored the action. Discussion includes three clinically relevant postulates: 1) Individuals 'privilege' speed or accuracy; 2) Mode of control is related to the performer's cognitive strategy and resources; and 3) Use of sensory information affects the level of efficiency in performing a task.

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